Service Manual. Sartorius Expert. LE-Models Electronic Analytical and Precision Balances. WLE5001-e04022

Transcription

1 Service Manual Sartorius Expert LE-Models Electronic Analytical and Precision Balances WLE5001-e04022

2 Table of Contents 04 General Information 04 Fundamentals at a Glance 05 Service Concept for LE Balances 06 General Instructions 07 Service Procedures: Brief Descriptions 09 Models with Special Weighing Systems 09 Design 1 10 Design 2 11 Design 3 12 Design 4 13 Auxiliary Service Tools, Equipment and Weights 13 Accompanying Literature 15 Handling and Operation 15 Functions of the Keys 16 Displaying the Hardware and Software Versions 17 Service Switch Function 17 Operating Menu Access Switch 18 Operating Menu: Brief Description 18 Accessing the Operating Menu and Changing the Settings 20 Operating Menu Settings (Rel BAC Version) 25 BPI Service Switch Function 25 Activating the BPI Mode 27 Balances with a Monolithic Weigh Cell 27 Testing and Adjustment Sequence 28 Overload Stops 28 Checking the Repeatability (Standard Deviation) 29 Off-center Loading Error 29 Checking the Off-center Loading Error 30 Adjusting the Off-center Loading Error 31 3-point Measurement 33 Span Adjustment 33 External Adjustment 34 Overwriting the Internal Calibration Weight 36 Internal Span Adjustment 37 Linearity 37 Checking the Linearity 37 Adjusting the Linearity 39 Overwriting the Internal Linearization Weight 41 Balances with Double-Lever Systems 41 Testing and Adjustment Sequence 41 Overload Stops 42 Checking the Repeatability (Standard Deviation) 43 Off-center Loading Error 44 Checking the Off-center Loading Error 2

3 45 Adjusting the Off-center Loading Error 46 3-point Adjustment 47 Procedure for Adjusting the Off-Center Loading Error 48 Off-Center Loading Error 49 Span Adjustment 49 External Adjustment 51 Overwriting the Internal Calibration Weight 53 Internal Span Adjustment 54 Linearity 54 Checking the Linearity 54 Adjusting the Linearity 56 Overwriting the Internal Linearity Weight 58 Repairing the Balance 58 Opening the Balance (Design 3) 59 Closing the Balance (Design 3) 60 Opening the Balance (Design 1 and 2) 61 Closing the Balance (Design 1 and 2) 62 Opening the Balance (Design 4) 63 Closing the Balance (Design 4) 64 Error Codes 68 Service Specifications 3

4 Generals Information Fundamentals at a Glance We strongly recommend completing a service training course at Sartorius before performing work on Sartorius weighing instruments. Please do not attempt or permit any unauthorized repair work. 4

5 Service Concept for LE Balances Valid until Revoked - All calibration/adjustment work required for putting the equipment into operation and for testing must be performed in accordance with the operating instructions. - Defects in quality: o Report any defects in quality to the Quality Management Department (WQM) at Sartorius AG in Goettingen. - Defective balances o o o Warranty. Within the first 6 months of installation, any defective balance covered by the warranty should be replaced. Seal of warranty. If you have to remove the Seal of Warranty, please affix your control seal with the Sartorius logo to the unit. In other cases, proceed according to OAW135 (standard operating procedure for equipment returned for repairs). Defective weigh cells. Proceed as described in the Service Concept for Weighing Cells; Service Information from June 2001, OAW135-2/3 (Organizational Procedure for Performing Repair Work and Providing Replacement Equipment). Defective electronics. Send the balance, along with an error report, to the Central Mechanics Workshop (ZW) in Goettingen (OAW135-2). Broken draft shields; weighing pan can no longer be used; replacing small parts, etc. 5

6 General Instructions Transport: - Always switch off the balance by pressing the e key and then wait approximately 10 seconds before unplugging it from the outlet (mains supply). When a balance with an internal calibration weight is running in the calibration mode, the internal calibration weights are exposed. If you disconnect the balance from power without switching it off first, the exposed weight can cause the weighing system to be damaged during transport. When the balance is switched off properly, the weights are locked in place. - Before you plug in or remove any connecting cables, always disconnect the balance from the power supply, as otherwise components can become destroyed. Changing the Battery Important Note: When replacing the battery, make sure that: - you use a new battery that is identical to the old one or equivalent to the battery recommended by the manufacturer. - the poles are correctly positioned when soldering in the battery. If you use the wrong type of battery, this may result in an explosion.make sure to dispose of the old battery properly according to your country s environmental protection laws. Aut11436.jpg 6

7 Service Procedures: Brief Descriptions Procedure for testing and 1. Test the repeatability adjusting the balance Balance with monolithic weigh cell: standard deviation; see page 28 Balance with double-lever system: standard deviation; see page Test the off-center loading error and adjust as required Balance with monolithic weigh cell: see pages Balance with double-lever system: see pages Adjust the sensitivity with external calibration weight Balance with monolithic weigh cell: see page 33 Define internal calibration weight if nec.: see pages Balance with double-lever system: see pages Adjust the linearity, preferably using the sequential method or with calibrated (certified) weights. Balance with monolithic weigh cell: see page 37 Define internal calibration weight if nec.: see page 38 Balance with double-lever system: see page 51 Activating the BPI mode/ deactivating write-protection Activating write-protection/ deactivating BPI mode Replacing the PCB Perform only before working with Sartorius Service Software, for calibration/ adjustment, linearization and programming a data record when replacing the main PCB. It is essential that you activate the Close function after using the Sartorius Service Software, as this resets the data transfer protocol from BPI to SBI and activates the write-protection (see page 25). If necessary, you can reset the equipment to the SBI mode by selecting the 9-1 menu item When ordering the replacement PCB, always indicate the model and serial number of the balance/scale in question so that the new PCB can be programmed at the factory. 7

8 Weighing systems Monolithic weigh cell; double-lever system Opening the housing - Remove the sealed screw on the reverse side and slide back the upper half of the housing. - After closing the balance/scale, a new control seal must be affixed by the service technician or service organization. Service software Must be used for adjusting weighing instruments when tolerance levels are exceeded by ± 2%. Do not use outdated software versions. Adjusting the off-center load On double-lever systems, perform by filing. On models LE244S and LE324S, perform using the off-center loading error adjustment screws Span adjustment Can be performed using built-in weight or external calibrated (certified) weights. Menu access switch It is not necessary to open the menu access switch for external calibration/ adjustment, as the menu code setting (external span adjustment) makes external calibration/adjustment functions generally accessible. After activating menu code ( read parameters only ), you can use the menu access switch to protect the menu from changes (position on the right) or allow changes in settings (left-hand position). 8 * ) = Not on models LE244S and LE324S

9 LE2_01.eps Models with Special Weighing Systems Design 1 Semi-microbalances Weigh cell: monolithic Resolution: 0.01 / 0.1mg Internal calibration weight: 270g Fine adjustment of off-center loading error: digits LE225D Analytical balances Weighing system: double-lever Resolution: 0.1mg Internal calibration weight: 270g Fine adjustment of off-center loading error: digits Preload (dead weight): 0.5mm brass plate LE324S, LE244S, Aut12352b.jpg Aut12361a.jpg 9

10 Design 2 Precision balances Weighing system: Double-lever Resolution: 1mg Internal calibration weight: 400g Preload (dead weight): 0.5mm brass plate LE323S, LE623S, LE623P LE2_06.eps Aut12367a.jpg 10

11 Design 3 Precision balances Weighing system: double-lever Resolution: 10mg Internal calibration weight: 270g Preload (dead weight): 0.5mm aluminum plate LE6202S, LE6202P, LE4202S, LE2202S LE_01.eps Weighing system: double-lever Resolution: 100mg Internal calibration weight: 400g Preload (dead weight): 1 mm brass plate LE10001, LE5201 Aut12374a.jpg Aut12377a.jpg 11

12 Design 4 Precision balances Weighing system: double-lever Resolution: 100mg Internal calibration weight: 17000g LE34001S, LE34001P, LE16001S AUT12307a.JPG LE2_11grau.jpg Aut5254a.jpg 12

13 Caution: Auxiliary Service Tools, Equipment and Weights After completing service work that entails removing the seal (warranty sticker), make sure to seal the balance by affixing your control seal with the Sartorius logo to the housing. Please make sure that you use the proper tools and equipment and that the balance/scale is set up on a solid, level surface in a clean work area that is free of vibrations and drafts. Sartorius service software and RS-232 connecting cable (25-Pin) or RS-232 connecting cable (9-Pin)

14 In addition to your standard tools and equipment, you will need the following sets of weights when working on Sartorius Expert balances: For Model Accuracy Weight Catalog No.: class (OIML) in grams LE225D E2 1x200 + YCW LE324S, LE244S 1x100 YCW5128 LE623S, LE323S F1 1x200 YCW5238 LE623P F1 1x100 YCW5138 LE1003 E2 1x1000 YCW6128 LE6202P, LE2202S F1 1x1000 YCW6138 LE6202S, LE4202S F1 1x2000 YCW6238 LE10001, LE5201 F1 1x5000 YCW6538 LE34001S, F1 1x10000 YCW7138 LE34001P LE16001S Accompanying Literature Operating instructions for Sartorius Expert (LE Series), publication no: WLE6001-d

15 Handling and Operation Functions of the Keys Position Designation 1 Weight units 2 Taring 3 Symbol: GLP printing mode active 4 Symbol: Printing mode active 5 Display: Data in memory for net-total formulation program 6 Data output: Press this key to output readout values to the built-in data interface. 7 Function key: Start application program 8 Symbols for active application 9 Start calibration/adjustment routine Bedienf_N.eps Position Designation 10 Delete (Clear Function) This key is generally used to cancel functions. Quit application program Cancel calibration/adjustment routine 11 On/off 12 Display: Calibration/adjustment function 13 Display: Animal weighing with automatic start 14 Symbols for stand-by mode or zero range 15 Weight value displayed in selected weight unit 15

16 Displaying the Hardware and Software Versions - Turn the balance on and back off again with the e key. - While all display segments are lit ( Segment Test ), press the p key briefly to display the version numbers (see example on the left). Anz-007F.eps - The version numbers are displayed for approx. 3 seconds. - The first digit(s) shown indicate the hardware version, and the last 2 digits show the software version. - The display then returns to the normal weighing mode. Anz-000F.eps 16

17 Service Switch Function 2 Operating Menu Access Switch The menu access switch (2) is located on the rear panel of the balance. Caution: Leave the menu access switch in the left-hand position (see illustration, left). Aut_4106a.jpg / CP_bpi_sch.eps Left open Note: 2 Right closed The use of this switch depends on the standard balance model: 1. On standard balances (not legal for trade), external span adjustment can be performed after menu code has been activated. It is not necessary to move the menu access switch. 2. When menu code (parameters are read-only ) is set, the position of the menu access switch determines whether parameters are read-only (switch on the right) or can be modified (switch on the left). Span adjustment with external weights can be performed without the Sartorius service software if the deviation does not exceed ± 2% of the required weight. Procedure: 1. Open the menu access switch 2. Activate menu code Press the q key 4. Adjust the balance 5. Make sure to close the menu access switch again at the conclusion of adjustment. 17

18 Operating Menu: Brief Description Accessing the Operating Menu and Changing the Settings Accessing the Menu: e and t - Turn the balance off and back on by pressing the e key. - Press t briefly while all display segments are lit. - 1 is displayed. Anz-001F.eps Note: When -1 is displayed, this indicates that the operating menu is locked (menu access switch closed) and menu code (parameters read-only ) is activated. To unlock the menu to change the menu code settings, move the menu access switch to the left. Move the switch back to the right after you have made your changes. Selecting a Menu Item: q and p - Press the q key to change the selected number; the display scrolls from 1 to 9 and starts over again at 1 Anz-002F.eps 18

19 - Press the p key to change the cursor position (the cursor moves from the 1st to the 2nd to the 3rd position and then back to the 1st, etc.) Changing a Menu Code Setting: t Anz-003F.eps - Briefly press one of the t keys to confirm desired setting. appears after the new setting; e.g., To store the setting, press and hold one of the t keys for more than two seconds. Anz-004F.eps Exiting the Menu without Saving Changes: - To exit a menu level, press p. This returns you to the first level of the balance operating menu. Anz-005F.eps - If you do not wish to save changes, press e to exit the menu (balance is switched off). Anz-006F.eps 19

20 Operating Menu Settings (Rel BAC Version) Menu 1 Weighing 1 1 Filter Selection Very stable conditions o Stable conditions Unstable conditions Very unstable conditions 1 2 Application Filter o Standard weighing mode Manual filling mode 1 3 Stability Range /4 digit /2 digit digit o 2 digits digits digits* o) = Factory setting 1) = Mod= Not on verified balances of accuracy class K *) = Setting cannot be changed on verified balances 1 5 Tare Parameter* At any time o Not until readout is stable 1 6 Auto Zero Function o Auto Zero on Auto Zero off 1 7 1st Weight Unit Grams (Display: o)* o Grams (Display: g) Kilograms Carats Pounds* Ounces* Troy ounces* Hong Kong taels* Singapore taels* Taiwanese taels* Grains* Pennyweights* Milligrams Parts per pound* Chinese taels* Momme* Austrian carats* 20

21 Tola* Baht* Mesghal* 1 8 Range 1 Display Mode* o All digits Reduced by 1 digit* 1 9 Calibration /Adjustment Function External calibration/adjustment o Internal calibration/adjustment q key blocked 1 10 Calibration /Adjustment Sequence o Calibrate, then auto adjust Calibrate, then manual adjust 1 11 Weight Unit for Calibration Weight o Grams Kilograms Pounds 1 15 isocal Function Off Adjustment prompt only o On Menu 2 Application Programs 2 1 Program selection Weighing as the basic function o Toggle weight units (mass unit conversion) Counting Weighing in percent Net total formulation Animal weighing / Averaging Menu 3 Application Parameters 3 1 2nd Weight Unit Grams (Display: o)* o Grams (Display: g) Kilograms Carats Pounds* Ounces* Troy ounces* Hong Kong taels* Singapore taels* Taiwanese taels* Grains* 1 ) =Not on verified balances of accuracy class K 2) = Model LE225D(-0CE) only *) = Setting cannot be changed on verified balances 4) = When operating menu access switch closed (otherwise, Ext. cal./adjust.) 21

22 Pennyweights* Milligrams Parts per pound* Chinese taels* Mommes* Austrian carats* Tola* Baht* Mesghal* 3 2 Range 2 Display Mode * o All digits Reduced by 1 digit 3 7 Animal Actvity for Delaying Start until: Stable conditions (calm) o Normal Unstable conditions (active) 3 8 Animal Weighing Will Start by Manual mode o Automatic mode Menu 4 Application Parameters - Counting 4 1 Auto reference sample updating function o Off On 3 5 Resolution for Counting and Weighing in Percent Display accuracy (internal resolution) o Full accuracy Menu 5 Data Interface 5 1 Baud rate baud baud baud 3 6 Decimal Places for Calculations o 1200 baud None baud o Without one decimal place baud Without two decimal places baud Without three decimal places ,200 baud o) = Factory setting *) = Setting cannot be changed on verified balances 22

23 5 2 Parity Mark Space o Odd Even 5 3 Number of Stop Bits o 1 stop bit stop bits 5 4 Handshake Mode Software handshake o Hardware handshake, 2 char. after CTS Hardware handshake, 1 char. after CTS 5 5 Communication Mode o SBI (ASCII) Universal printer Menu 6 Utilities for Printouts/ Basic Function Weighing 6 1 Manual/Auto print Manual with p key without stability o Manual with p key after stability Manual with p key at stability Auto print without stability Auto print at stability Auto print when load changes 2) 6 2 Automatic Printing Start/stop auto print using the p key o Auto print not stoppable 6 3 Time-Dependent Printouts at Defi ned Intervals o 1 display update display update 6 4 Automatic Taring after Each Printout o Off On Menu 7 Print Application Programs 7 1 Print Application Parameter Off o On; all param On; only main parameters 7 2 Print Format Raw data (16 char.) o For other apps (22 char.) 23

24 7 3 Auto Print Net Total Formulation/2nd Tare Memory o Auto print last value N Auto print total T1 Menu 8 Extra Functions 8 1 Menu Access Function * o Parameter settings alterable Read only 8 2 Acoustic signal o On Off 8 3 Key Functions o Accessible Blocked 8 4 Universal Switch for Remote Control o p t q v c 8 5 Power-On Mode o Off/on/Stand-by Stand-by/on Auto on 8 8 Reference Weighing for Counting Small Parts o Off On for QC scale On for FB/FC/LA/LP scales On for isi terminal 8 10 ISO/GLP-compliant Printout o No ISO/GLP-compliant printout Only for calibration/adjustment Always on Menu 9 Reset Menu to Factory Settings 9-1 Restore 9-2 o Do not restore Achtung: Bevor Menü-Reset ausführt wird, notieren Sie sich ggf. die einge stellte Menüpunkte o) = Factory setting *) = Setting cannot be changed on verified balances 24

25 BPI Service Switch Function 1 Activating the BPI Mode The BPI switch (1) is used to prepare for working the service software and is located on the rear panel. The middle opening is intended for the BPI switch (1) (see figure left). Note: The balance must be set to the BPI mode (=Binary Processor Interface Mode) to use Sartorius service software (e.g. for linearization /span adjustment or when replacing the PCB). Aut_4106a.jpg / CP_bpi_t.eps Anz-020F.eps Anz-018F.eps - Turn on the balance using the e key and wait for the segment test on the balance to run, i.e. until g (e.g.; on model LE623S) is displayed. - Remove (unscrew) the threaded cap from the rear panel of the balance, located to the left of the DC jack. - The BPI switch is now accessible through the opening. Press the BPI switch once, e.g. with a ball-point pen, and hold it in: - The display goes blank (segment check is executed). - After about 3 seconds, the interface is in the BPI mode. - Release the BPI switch; the readout returns to normal, and the balance is now in BPI mode. Anz-00F.eps 25

26 - Cover the opening on the back panel of the balance with the threaded cap. - You can now use the Sartorius service software to check and adjust the balance. Caution: After working in BPI mode, make sure to set the write-protection using the Sartorius service software, to return the balance to the standard data output mode (SBI mode =Sartorius Balance Interface). If the balance is in the BPI mode (= Binary Processor Interface mode) when you press p key, the error code ERR 30 will be displayed. Anz-019F.eps You cannot run standard peripheral devices until you set the balance to the SBI mode. Note: If necessary, you can switch from SBI to BPI by activating menu code 9 1 ( Menu reset ). 26

27 Balances with a Monolithic Weigh Cell Testing and Adjustment Sequence Preparation: Note: Place the balance on a solid, level surface that is free of vibration, e.g., a stoneslab weighing table. Level the balance using the level indicator. Turn the balance and allow it to warm up for 4 to 24 h. Calibrate/adjust the balance at the current location. Testing must be carried out according to the Sartorius standard operating procedures for testing: WKD These SOPs specify the same adjustment data as those described in this service manual. You will need to check and, if necessary, adjust the following: 1. Repeatability 2. Off-center loading error 3. Span adjustment: External span adjustment Overwrite internal calibration weight Internal span adjustment 4. Linearity External linearity Overwrite internal linearity weight 27

28 Note: Overload Stops Overload stops do not need to be checked, as these are set and adjusted at the factory. Waags_Just.eps Front Checking the Repeatability (Standard Deviation) - Select the test weight from the service specifications (see pp ). - Unload the weighing pan and zero the balance using the t key. - Center the test weight on the weighing pan. - Write down the weight displayed. - Repeat the procedure five times. - The repeatability is calculated from the 6 weighing operations as follows: S = (Max. value displayed - Min. value displayed) / 3 - Compare the calculated value with the tolerances listed in the service specifications. - If the result exceeds the tolerance limits, this may be due to one of the following circumstances: The weighing system needs to be cleaned A mechanical part (e.g., lever) is touching the weighing system Bent or defective flexural parts Strong vibration at the place of installation 28

29 Important: Off-Center Loading Error Checking and Adjusting the Off-Center Loading Error An excessive off-center loading error will have a negative effect on the repeatability of the weighing system. In accordance with OIML Directive R76-1 for testing the off-center loading error with rectangular, round and three-cornered weighing pans, the pan is quartered and the test weight placed on each of the four segments in turn. Please see the diagrams below for the off-center load test points. It can be helpful to mark the test points on the weighing pan. Checking the Off-Center Loading Error Note: Refer to the service specifications (pages 68-69) for the test weights to use. LE balance with draft shield: Model: LE225D Place the test weight on position 1 on the weighing pan and zero the balance by pressing the t key. - Place the test weight in positions 2, 3, 4 and 5 in sequence and write down the readout at stability, including the plus/minus signs. - If the off-center loading error is too great, adjust the balance so that the off-center loading error is within the tolerances specified. Eck5-dr.eps 29

30 Adjusting the Off-Center Loading Error Off-center loading errors are determined by carrying out a 3-point adjustment. The 3-point adjustment shows the greatest possible off-center loading error on the balance. Note: You have to open the balance to adjust the off-center loading error. Open the balance (see page 68-69). Re-connect power, if disconnected. Important: closes open K Winds.jpg Exercise extreme caution when performing the adjustment, as you will be working on an opened balance while the equipment is carrying voltage. The adjustment screws (see arrows, below) are now accessible. Use the two adjusting screws to adjust the off-center load (see page 31 for details). To check the off-center load following adjustment, close the balance housing and position the weighing pan on the balance. Allow approximately 3 to 5 minutes for the balance to warm up. Perform the 3-point adjustment as described on page

31 B A C 3-Point Measurement - Place the test weight in position A on the weighing pan and zero the balance by pressing t. - Place the test weight in positions B and C in that order, and write down the value displayed at stability in each case. - Example: Position A t key g Position B g Position C g eckl_e03.eps - Adjust only the side with the greatest error (absolute value) as follows: Negative errors: Turn the adjustment screw inwards (clockwise) Positive errors: Turn the adjustment screw outwards (counterclockwise) - Change the position of each screw in small increments and measure the offcenter loading error at positions A, B and C after each adjustment. - Repeat this procedure until the off-center loading error is within the tolerance range at all 3 positions. AUT13765a.JPG Note: Important: After adjusting the off-center loading error, the linearity and span must be checked and, if necessary, adjusted. Make sure the data cable is not damaged when closing the balance housing. 31

32 closes open Winds.jpg K Place the top of the housing over the balance at a light angle so that the two retainers (below the keypad) click into the two screws (at the front of the weighing chamber). Push the upper part of the of the balance forward carefully, and then press it down gently. Tighten the screw (K) to secure the housing and apply the warranty sticker. Open the sliding lock device on the back of the draft shield. Position the draft shield correctly on the balance, press down lightly on the top of the draft shield and close the sliding lock device. Place the shield ring and weighing pan inside the weighing chamber. 32

33 Span Adjustment Important: External Span Adjustment Use only calibrated weights for this adjustment. There are two methods for adjusting the span. Anz-024F.eps Anz-200F.eps Anz-026F.eps Important: Waags_Just.eps Front 1. As described in this manual 2. Using the Sartorius service software - Check the balance operating menu to make sure menu code 1 9 1, External cal./adj. accessible or 1 9 7, External cal./adj. with menu access switch closed, is set (see pp , Operating Menu Settings ). - If necessary, tare the balance by pressing the t key. Press q to activate the calibration/adjustment routine. - The calibration weight required is displayed (depends on the model, this example shows the LE225D). The balance only accepts a weight that is within a tolerance range of approx. 2% of the nominal value. Errors exceeding this tolerance range can only be corrected using the Sartorius service software. - Center the required weight (e.g. 200 g/e1) on the weighing pan and close the draft shield. - After the calibration weight has been stored, the balance will return to the weighing mode. If menu code , Calibrate, then manual adjust is set, the calibration weight value is displayed only; press q to adjust. 33

34 Caution: Important: Note: Overwriting the Internal Calibration Weight The internal calibration weight on LE balances should only be overwritten using the Sartorius service software, since the factory setting of the internal calibration weight is highly accurate. Use the balance s overwrite program perform the overwrite routine only in the case of emergency; for example, if the service software is not available. Before overwriting the internal calibration weight, the span must be adjusted correctly. Allow the balance must warm up for at least 4-24 hours before beginning. There are two methods available for overwriting the internal calibration weight in LE balances. 1. As described in this manual 2. Using the Sartorius service software - Make sure menu code 1 9 3,- Internal calibration/adjustment accessible is set (see pp , Operating Menu Settings ). Anz-009F.eps 34

35 Left open bpi_sch.eps Right closed - Move the menu access switch to the left. This switch is accessible through an opening on the back of the balance. - If you have not done so already, perform external calibration/adjustment (see page 49). - Turn off the balance by pressing e. Anz-210F.eps Anz-016F.eps - Turn the balance back on by pressing e while simultaneously holding down the q key until the readout shown on the left appears. - Press the t key to tare the balance; then press q to activate the overwrite internal calibration weight function. - The built-in, motorized internal calibration weight is applied, then removed automatically; the weight value is overwritten; and the balance returns to the normal weighing mode. - Press the q key to check the external span adjustment again. Anz-201F.eps 35

36 Internal Span Adjustment - Make sure menu code 1 9 3,- Internal calibration/adjustment accessible is set (see pp , Operating Menu Settings ). Anz-009F.eps - Press the t key to tare the balance; then press q to activate the calibration/adjustment function.. Anz-016F.eps Anz-201F.eps - The built-in, motorized internal calibration weight is applied, then removed automatically; the weight value is overwritten; and the balance returns to the normal weighing mode. Left open Right closed - Move the menu access switch back to the right. Replace the protective cap to cover the switch. bpi_sch.eps 36

37 Linearity Note: Checking the Linearity The linearity must be tested in accordance with WKD-038 (standard operating procedure). - Check the linearity of the balance for the entire weighing range in 4 equal steps. - Compare the values displayed with the tolerance ranges given in the service specifications (pp ). - If the errors exceed the permissible tolerance ranges, the linearity must be adjusted. Adjusting the Linearity Use the service software to adjust linearity. Activate the BPI mode (see page 25) Connect the balance/scale to the PC and call the linearity program in the service software. After linearity has been adjusted, activate the Close function in the service software to reset the balance/scale to the SBI mode. Test the span and adjust if necessary (see page 49, Span Adjustment ). 37

38 Alternative manual procedure: Anz-008F.eps - Make sure menu code 1 9 5, External linearization accessible is set (see pp , Operating Menu Settings ). - Switch on the balance by pressing e. - If necessary, tare the balance by pressing t. - Press the q key until the display on the left appears. Anz-210F.eps Anz-211F.eps Caution! Note: - Place the required weight on the weighing pan. If the required weight is within ±2% of the tolerance range of the displayed value, the plus sign will go out. If not, the minus sign will appear. Errors that are too great can be adjusted only with the service software. - Remove the weight and, if necessary, press the t key to tare the balance. - Repeat this procedure until you are prompted to unload the balance. - After the zero point value has been stored, the balance will return to the standard weighing mode. After working in the BPI mode, make sure to set the write-protect again so that the balance returns to the standard data record output mode (SBI mode = Sartorius Balance Interface) and peripheral devices can be connected. (SBI mode = Sartorius Balance Interface Mode) (BPI mode = Binary Processor Interface Mode) 38

39 Overwriting the Internal Linearization Weight The factory setting of the internal linearization weights is highly accurate: - If overwriting these weights is necessary, this indicates a mechanical or electrical error. - Allow the balance to warm up for at least 6 hours. Note: There are two methods available for overwriting the internal calibration weight on LE balances. 1. As described in this manual 2. Using the Sartorius service software Anz-208F.eps - Make sure that the menu code 1 9 6, Internal linearization accessible is set (see pp , Operating Menu Settings ). - If you have not done so already, perform external linearization/adjustment. - Move the menu access switch to the right. This switch is accessible through an opening on the back of the balance. - Turn the balance back on by pressing e and then press the q key until the readout shown on the left appears. - Press the t key to tare the balance; then press q to activate the overwrite function. Anz-210F.eps 39

40 Left open bpi_sch.eps Right closed - The built-in, motorized internal linearization weights are applied, then removed automatically; the weight value is stored in the EEPROM of the processor; and the balance returns to the normal weighing mode. - After completing the linearization routine, reset menu code to and move the menu access switch to the left (menu locked). Replace the protective cap to cover the switch. 40

41 Balances with a Double-Lever System Testing and Adjustment Sequence Preparation: Note: Place the balance on a solid, level surface that is free of vibration, e.g. a stone-slab weighing table. Level the balance using the level indicator. Turn the balance and allow it to warm up for about minutes, depending on the model. Calibrate/adjust the balance at the current location. Testing must be carried out according to the following Sartorius Standard Operating Procedure for Testing WKD They are also equivalent to the given adjustment data as described in this service manual. You will need to check and, if necessary, adjust the following: 1. Repeatability 2. Off-center loading error 3. Span adjustment 4. External linearity Note: Overload Stops Overload stops no longer need to be checked on double-lever systems, as they are set and adjusted at the factory. 41

42 Waags_Just.eps Front Checking the Repeatability (Standard Deviation) - Select the test weight from the service specifications (see pp ). - Unload the weighing pan and zero the balance using the t key. - Center the test weight on the weighing pan. - Write down the weight displayed. - Repeat the procedure five times. - The repeatability is calculated from the 6 weighing operations as follows: S = (Max. value displayed - Min. value displayed) / 3 - Compare the calculated value with the tolerances listed in the service specifications. - If the result exceeds the tolerance limits, this may be due to one of the following circumstances: The weighing system needs to be cleaned A mechanical part (e.g., lever) is touching the weighing system Bent or defective flexural parts Eckre01.PMD 42

43 Off-center Loading Error Important: An excessive off-center loading error will have a negative effect on the repeatability of the weighing system. In accordance with OIML Directive R76-1 for testing the off-center loading error with rectangular, round and three-cornered weighing pans, the pan is quartered and the test weight placed on each of the four segments in turn. Please see the diagrams below for the off-center load test points. It can be helpful to mark the test points on the weighing pan. 43

44 Checking the Off-Center Loading Error Note: Refer to the service specifications (pages 68-69) for the test weights to use. LE balances with draft shield and three-sided weighing pan Eck_dr_wh1-1.eps Eck_re_2.eps Front 1 4 Models: LE324S; LE244S; LE323S; LE623S; LE623P - Place the test weight on position 1 on the weighing pan and zero the balance by pressing the t key. - Place the test weight in positions 2, 3, 4 and 5 in sequence and write down the readout at stability, including the plus/minus signs. - If the off-center loading error is too great, adjust the balance so that the off-center loading error is within the tolerances specified. LE balances with rectangular weighing pan Models: LE6202S; LE6202P; LE4202S; LE2202S; LE10001; Le5201 LE34001S; LE34001P; LE16001S Compare the off-center loading error values with those given in the service specifications (pages 68-69). - If the off-center loading error is too great, adjust the balance so that the off-center loading error is within the tolerances specified. 44

45 Note: Adjusting the Off-Center Loading Error After adjusting the off-center loading error, the linearity and span must be checked and, if necessary, adjusted. Procedure for Adjusting the Off-Center Loading Error (Double-Lever System with Adjustment Screws (see arrows)) Use a 3-point measurement to determine the off-center loading error. The off-center loading error of the balance is indicated by the results of the 3-point measurement. Perform 3-point measurement to determine the off-center loading error. AUT13761b.JPG Note: You have to open the balance to adjust the off-center loading error. Open the balance (see page 68-69). Re-connect power, if disconnected. Important: Exercise extreme caution when performing the adjustment, as you will be working on an opened balance while the equipment is carrying voltage. AUT13765a.JPG The adjustment screws (see arrows) are now accessible. Use the two adjusting screws to adjust the off-center load (see page 31). To check the off-center load following adjustment, close the balance housing and position the weighing pan on the balance. Allow approximately 3 to 5 minutes for the balance to warm up. Perform the 3-point adjustment as described on page

46 3-Point Adjustment B C - Place the test weight in position A on the weighing pan and zero the balance by pressing t. - Place the test weight in positions B and C in that order, and write down the value displayed at stability in each case. A - Example: Position A t key g Position B g Position C g eckl_e03.eps - Adjust only the side with the greatest error (absolute value) as follows: Negative errors: Turn the adjustment screw inwards (clockwise) Positive errors: Turn the adjustment screw outwards (counterclockwise) - Change the position of each screw in small increments and measure the offcenter loading error at positions A, B and C after each adjustment. - Repeat this procedure until the off-center loading error is within the tolerance range at all 3 positions. AUT13761b.JPG / AUT13765b.JPG Note: After adjusting the off-center loading error, the linearity and span must be checked and, if necessary, adjusted. 46

47 Procedure for Adjusting the Off-Center Loading Error (Double-Lever System) On models: LE323S; LE623S; LE623P;LE10001; LE5201;LE2202S; LE4202S; LE6202S; LE6202P (see upper illustration on the left) and Aut13859a.jpg on models: LE16001S; LE34001S; LE34001P (see lower illustration on the left) the off-center loading error is adjusted by carefully filing the thin parts on the upper guide. To avoid distortion of results, always allow a few seconds after filing for the thin part to cool down. Important: After carefully removing the upper part of the housing, adjust the off-center loading error by filing the rear thin parts with a tapered file. Test the off-center loading error and adjust the greatest error first, by filing carefully in the corresponding position (see illustrations on page 48). The position in which each off-center loading error is tested indicates the position in the weighing system to be adjusted as needed (see Overview of Off-center Loading Error Adjustment Positions on the next page). Aut12308b.jpg Overview of Off-center Loading Error Adjustment Positions 47

48 Front Right Left View Off-center loading error: View Back Positions to file:positions to file: Positions to file: Positions to file: Rear-left-top Rear-left-bottom Rear-right-bottom Rear-right-top LE_ecklj1.tif TE_Eck1d.eps Off-center loading error: View Side view of the system Top LE_ecklj2.tif Back Bottom Front winkh.tif Rear-right- Rear-right Rear-right-top Rear-right-bottom and and or or Left-top Left-bottom Rear-left-bottom Rear-left-top 48

49 Note: Anz-015F.eps Span Adjustment External Adjustment Allow the balance to warm up before performing span adjustment (30 min. to 24h, depending on the model) Use only calibrated weights for this adjustment. There are two methods for adjusting the span. 1. As described in this manual 2. Using the Sartorius service software - Check the balance operating menu to make sure menu code 1 9 1, External cal./adj. accessible or 1 9 7, External cal./adj. with menu access switch closed, is set (see pp , Operating Menu Settings ). - If necessary, tare the balance by pressing the t key. Press q to activate the calibration/adjustment routine. Anz-028F.eps - The calibration weight required is displayed (depends on the model, this example shows the LE6202S). Anz-029F.eps Important: The balance only accepts a weight that is within a tolerance range of approx. 2% of the nominal value. Errors exceeding this tolerance range can only be corrected using the Sartorius service software. 49

50 LE balances with draft shield and three-sided weighing pan Models: LE324S; LE244S; LE323S; LE623S; LE623P - Center the required weight (e.g. 200 g/e2; depends on model; this example shows LE623S) on the weighing pan and close the draft shield. Waags_Just.eps Front LE balances with rectangular draft shield Models: LE6202S; LE6202P; LE4202S; LE2202S; LE10001; LE5201; LE34001S; LE34001P; LE16001S - Center the required weight on the weighing pan and close the draft shield. Eckre01.PMD - After the calibration weight has been stored, the balance will return to the weighing mode. If menu code , Calibrate, then manual adjust is set, the calibration weight value is displayed only; press q to adjust. 50

51 Caution: Important: Overwriting the Internal Calibration Weight The internal calibration weight on LE balances should only be overwritten using the Sartorius service software, since the factory setting of the internal calibration weight is highly accurate. Use the balance s overwrite program perform the overwrite routine only in the case of emergency; for example, if the service software is not available. Before overwriting the internal calibration weight, the span must be adjusted correctly. Allow the balance must warm up for at least 4-24 hours before beginning. Note: There are various ways of overwriting the internal calibration weight on CP balances. 1. As described in this manual 2. Using the Sartorius service software - Make sure menu code 1 9 3,- Internal calibration/adjustment accessible is set (see pp , Operating Menu Settings ). Anz-009F.eps 51

52 Left open Right closed - Slide the menu access switch to the left. It is accessible via an opening on the back of the balance. - If you have not done so already, perform external calibration/adjustment (see page 33). bpi_sch.eps - Turn off the balance by pressing e. - Turn the balance back on by pressing e while simultaneously holding down the q key until the readout shown on the left appears. Anz-210F.eps - Press the t key to tare the balance; then press q to activate the overwrite internal calibration weight function. Anz-016F.eps Anz-201F.eps - The built-in, motorized internal calibration weight is applied, then removed automatically; the weight value is overwritten; and the balance returns to the normal weighing mode. - Press the q key to check the external span adjustment again. 52

53 Note: Internal Span Adjustment Performed only on balances with a built-in calibration weight. - Make sure menu code 1 9 3,- Internal calibration/adjustment accessible is set (see pp , Operating Menu Settings ). Anz-009F.eps - Press the t key to tare the balance; then press q to activate the calibration/adjustment function.. Anz-016F.eps - The built-in, motorized internal calibration weight is applied, then removed automatically; the weight value is overwritten; and the balance returns to the normal weighing mode. Anz-201F.eps Left open Right closed - Move the menu access switch back to the right. Replace the protective cap to cover the switch. bpi_sch.eps 53

54 Linearity Note: Checking the Linearity The linearity must be tested in accordance with WKD-038 (standard operating procedure). - Check the linearity of the balance for the entire weighing range in 4 equal steps. - Compare the values displayed with the tolerance ranges given in the service specifications (pp ). - If the errors exceed the permissible tolerance ranges, the linearity must be adjusted. Adjusting the Linearity Use the service software to adjust linearity. Activate the BPI mode (see page 25) Connect the balance/scale to the PC and call the linearity program in the service software. After linearity has been adjusted, activate the Close function in the service software to reset the balance/scale to the SBI mode. Test the span and adjust if necessary (see page 49, Span Adjustment ). 54

55 Alternative manual procedure: Anz-008F.eps - Make sure menu code 1 9 5, External linearization accessible is set (see pp , Operating Menu Settings ). - Switch on the balance by pressing e. - If necessary, tare the balance by pressing t. - Press the q key until the display on the left appears. Anz-210F.eps Anz-211F.eps - Place the required weight on the weighing pan. If the required weight is within ±2% of the tolerance range of the displayed value, the plus sign will go out. If not, the minus sign will appear. Errors that are too great can be adjusted only with the service software. - Remove the weight and, if necessary, press the t key to tare the balance. - Repeat this procedure until you are prompted to unload the balance. - After the zero point value has been stored, the balance will return to the standard weighing mode. Caution! Note: After working in the BPI mode, make sure to set the write-protect again so that the balance returns to the standard data record output mode (SBI mode = Sartorius Balance Interface) and peripheral devices can be connected. (SBI mode = Sartorius Balance Interface Mode) (BPI mode = Binary Processor Interface Mode) 55

56 Overwriting the Internal Linearization Weight The factory setting of the internal linearization weights is highly accurate: - If overwriting these weights is necessary, this indicates a mechanical or electrical error. - Allow the balance to warm up for at least 6 hours. Note: There are two methods available for overwriting the internal calibration weight on LE balances. 1. As described in this manual 2. Using the Sartorius service software Anz-208F.eps - Make sure that the menu code 1 9 6, Internal linearization accessible is set (see pp , Operating Menu Settings ). - If you have not done so already, perform external linearization/adjustment. - Move the menu access switch to the right. This switch is accessible through an opening on the back of the balance. Anz-210F.eps - Turn the balance back on by pressing e and then press the q key until the readout shown on the left appears. - Press the t key to tare the balance; then press q to activate the overwrite function. 56

57 Left open Right closed - The built-in, motorized internal linearization weights are applied, then removed automatically; the weight value is stored in the EEPROM of the processor; and the balance returns to the normal weighing mode. - After completing the linearization routine, reset menu code to and move the menu access switch to the left (menu locked). Replace the protective cap to cover the switch. bpi_sch.eps 57

58 Repairing the Balance Opening the Balance (Design 3) Models: LE2202S, LE4202S, LE6202S, LE6202P, LE5201, LE10001 Warning: Removing the seal (warranty sticker) results in forfeiture of all claims under the manufacturer s warranty. Aut13865a.jpg - Disconnect the equipment from power. - Remove the weighing pan, 4 shock absorbers and base plate. - Use a Phillips screwdriver to break the warranty sticker, remove the sticker and the remove the Phillips-head screw. Aut13865b.jpg - Carefully raise the top of the housing at the back, push it gently towards the rear and then lift it off the balance. Winds.jpg 58

59 Make sure the ribbon cable from the display to the main PCB is not damaged Remove the two Allen screws to take out the pan support. Use caution at this point, as the spacing shims are exposed on the system. Aut13956.jpg - If necessary, you can disconnect the plug (see arrows); all subassemblies are now accessible. Note: If the display is required, do not unplug the connector! Aut13958.jpg AUT13859.JPG Important: Closing the Balance (Design 3) Plug in the cable if it was disconnected; install the pan support if it was removed. Place the top of the housing over the balance, push it forward and tighten the Phillips-head screws. Install the base plate, if applicable.. Position the 4 shock absorbers and then the weighing pan on the balance. Re-connect the balance to power. Check the balance functions. After the balance has been repaired and tested, the warranty sticker must be renewed. 59

60 Opening the Balance (Design 1 and 2) Models: LE225D, LE244S, LE324S, Warning: Removing the seal (warranty sticker) results in forfeiture of all claims under the manufacturer s warranty. - Disconnect the equipment from power. - Remove all movable parts from the balance, such as the weighing pan, etc. AUT14003.JPG Open the sliding lock device t the rear of the draft shield, remove the draft shield carefully and place it to one side. AUT14004.JPG If the balance has a base plate, remove it. Use a Phillips screwdriver to break and remove the warranty sticker, then remove the Phillips-head screw. AUT14005.JPG - Carefully raise the top of the housing at the back, push it gently towards the rear and then lift it off the balance. 60

61 Make sure the ribbon cable from the display to the main PCB is not damaged - This cable can be disconnect (see arrow) if necessary. Aut13956.jpg Note: If the display is required, do not unplug the connector! AUT13764a.JPG Remove the screws from the system cover and remove the cover. The system and all subassemblies are now accessible. Aut14020.jpg Closing the Balance (Design 1 and 2) Plug in the connector (if unplugged) and follow the above instructions in the opposite order to re-assemble the balance. Re-connect the balance to power. Check the balance functions. Aut14020.jpg Important: After the balance has been repaired and tested, the warranty sticker must be renewed. Aut14020.jpg 61

62 Opening the Balance (Design 4) Models: LE34001S, LE34001P, LE16001S Aut13875.jpg E Warning: Removing the seal (warranty sticker) results in forfeiture of all claims under the manufacturer s warranty. - Disconnect the balance from power. - Remove the weighing pan. The next step entails breaking the warranty sticker (105): - Remove the 10 screws (E) that fasten the cover plate (104). - The weighing system is now accessible. 107 F Aut13876.jpg Aut_5873a.jpg To gain access to the main PCB (108), proceed as follows: Aut12308a.jpg - Remove the 6 screws (F) from the back of the weighing platform and open the cover panel (107) by pulling downward (see illustration, lower left). - The PCB set is now accessible. - Perform the above steps in the opposite order to close the balance. 62

63 E Closing the Balance (Design 4) - Replace the cover panel (104) and fasten it with the 10 screws (E). - Carefully position each of the seals (103), making sure that they sit correctly below the seam on the weighing pan flexures, and fasten them each with 2 screws. Aut13875.jpg 105 Important: If the warranty sticker (105) is removed or damaged, make sure you affix a new sticker at the conclusion of adjustment or repair work. The seals (103) must not be under tension when installed, as this can lead to off-center load errors. Aut13876.jpg Aut13871a.jpg When installing the seals (103), make sure the rubber material is not damaged; otherwise the IP65 protection rating is no longer guaranteed. - Replace the load plate on the Balance. - Connect the Balance to the display and control unit. - The Balance is now ready to operate. 63